Ryan's gas tank is 1/10 full. After he buys 11 gallons of gas, it is 3/5 full. How many gallons can Ryan's tank hold?

I wanna say 22 gallons because once it started out 1/10 full, he added 11 gallons which brought it to 6/10 full (3/5) that means that he added 5/10 (or one half) to the tank so that would mean that 11 would be half the amount of what the tank could fit